At the time of the end-Permian extinction, Antarctica was some distance north of its present location, warmer than it is today, and not covered with permanent glaciers.
在二迭纪末时期，南极比现在的位置往北偏一些，比今天热一些，没有覆盖永久冰川。
2
It USES reflection of object, atmosphere extinction coefficient of two laser wavelengths and others key technology to improve the observational distance of laser radar.